<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>显示隐藏-切换</title>
    <link rel="stylesheet" href="../css/css.css">
</head>
<body>
<div class="container">
    <div class="box" >
        hello
    </div>
    <div>
        <button id="btnShow">显示</button>
        <button id="btnHide">隐藏</button>
        <button id="btnToggle">切换</button>
    </div>
</div>

</body>
<script src="../js/4.show-box.js"></script>

</html>